<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Org\Net;

/**
 * Http 工具类
 * 提供一系列的Http方法
 * 
 * @author liu21st <liu21st@gmail.com>
 */
class Http {
	
	/**
	 * 采集远程文件
	 * 
	 * @access public
	 * @param string $remote
	 *        	远程文件名
	 * @param string $local
	 *        	本地保存文件名
	 * @return mixed
	 */
	static public function curlDownload($remote, $local) {
		$cp = curl_init ( $remote );
		$fp = fopen ( $local, "w" );
		curl_setopt ( $cp, CURLOPT_FILE, $fp );
		curl_setopt ( $cp, CURLOPT_HEADER, 0 );
		curl_exec ( $cp );
		curl_close ( $cp );
		fclose ( $fp );
	}
	
	/**
	 * 使用 fsockopen 通过 HTTP 协议直接访问(采集)远程文件
	 * 如果主机或服务器没有开启 CURL 扩展可考虑使用
	 * fsockopen 比 CURL 稍慢,但性能稳定
	 * 
	 * @static
	 *
	 * @access public
	 * @param string $url
	 *        	远程URL
	 * @param array $conf
	 *        	其他配置信息
	 *        	int limit 分段读取字符个数
	 *        	string post post的内容,字符串或数组,key=value&形式
	 *        	string cookie 携带cookie访问,该参数是cookie内容
	 *        	string ip 如果该参数传入,$url将不被使用,ip访问优先
	 *        	int timeout 采集超时时间
	 *        	bool block 是否阻塞访问,默认为true
	 * @return mixed
	 */
	static public function fsockopenDownload($url, $conf = array()) {
		$return = '';
		if (! is_array ( $conf ))
			return $return;
		
		$matches = parse_url ( $url );
		! isset ( $matches ['host'] ) && $matches ['host'] = '';
		! isset ( $matches ['path'] ) && $matches ['path'] = '';
		! isset ( $matches ['query'] ) && $matches ['query'] = '';
		! isset ( $matches ['port'] ) && $matches ['port'] = '';
		$host = $matches ['host'];
		$path = $matches ['path'] ? $matches ['path'] . ($matches ['query'] ? '?' . $matches ['query'] : '') : '/';
		$port = ! empty ( $matches ['port'] ) ? $matches ['port'] : 80;
		
		$conf_arr = array (
				'limit' => 0,
				'post' => '',
				'cookie' => '',
				'ip' => '',
				'timeout' => 15,
				'block' => TRUE 
		);
		
		foreach ( array_merge ( $conf_arr, $conf ) as $k => $v )
			${$k} = $v;
		
		if ($post) {
			if (is_array ( $post )) {
				$post = http_build_query ( $post );
			}
			$out = "POST $path HTTP/1.0\r\n";
			$out .= "Accept: */*\r\n";
			// $out .= "Referer: $boardurl\r\n";
			$out .= "Accept-Language: zh-cn\r\n";
			$out .= "Content-Type: application/x-www-form-urlencoded\r\n";
			$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
			$out .= "Host: $host\r\n";
			$out .= 'Content-Length: ' . strlen ( $post ) . "\r\n";
			$out .= "Connection: Close\r\n";
			$out .= "Cache-Control: no-cache\r\n";
			$out .= "Cookie: $cookie\r\n\r\n";
			$out .= $post;
		} else {
			$out = "GET $path HTTP/1.0\r\n";
			$out .= "Accept: */*\r\n";
			// $out .= "Referer: $boardurl\r\n";
			$out .= "Accept-Language: zh-cn\r\n";
			$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
			$out .= "Host: $host\r\n";
			$out .= "Connection: Close\r\n";
			$out .= "Cookie: $cookie\r\n\r\n";
		}
		$fp = @fsockopen ( ($ip ? $ip : $host), $port, $errno, $errstr, $timeout );
		if (! $fp) {
			return '';
		} else {
			stream_set_blocking ( $fp, $block );
			stream_set_timeout ( $fp, $timeout );
			@fwrite ( $fp, $out );
			$status = stream_get_meta_data ( $fp );
			if (! $status ['timed_out']) {
				while ( ! feof ( $fp ) ) {
					if (($header = @fgets ( $fp )) && ($header == "\r\n" || $header == "\n")) {
						break;
					}
				}
				
				$stop = false;
				while ( ! feof ( $fp ) && ! $stop ) {
					$data = fread ( $fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit) );
					$return .= $data;
					if ($limit) {
						$limit -= strlen ( $data );
						$stop = $limit <= 0;
					}
				}
			}
			@fclose ( $fp );
			return $return;
		}
	}
	
	/**
	 * 下载文件
	 * 可以指定下载显示的文件名，并自动发送相应的Header信息
	 * 如果指定了content参数，则下载该参数的内容
	 * 
	 * @static
	 *
	 * @access public
	 * @param string $filename
	 *        	下载文件名
	 * @param string $showname
	 *        	下载显示的文件名
	 * @param string $content
	 *        	下载的内容
	 * @param integer $expire
	 *        	下载内容浏览器缓存时间
	 * @return void
	 */
	static public function download($filename, $showname = '', $content = '', $expire = 180) {
		if (is_file ( $filename )) {
			$length = filesize ( $filename );
		} elseif (is_file ( UPLOAD_PATH . $filename )) {
			$filename = UPLOAD_PATH . $filename;
			$length = filesize ( $filename );
		} elseif ($content != '') {
			$length = strlen ( $content );
		} else {
			E ( $filename . L ( '下载文件不存在！' ) );
		}
		if (empty ( $showname )) {
			$showname = $filename;
		}
		$showname = basename ( $showname );
		if (! empty ( $filename )) {
			$finfo = new \finfo ( FILEINFO_MIME );
			$type = $finfo->file ( $filename );
		} else {
			$type = "application/octet-stream";
		}
		// 发送Http Header信息 开始下载
		header ( "Pragma: public" );
		header ( "Cache-control: max-age=" . $expire );
		// header('Cache-Control: no-store, no-cache, must-revalidate');
		header ( "Expires: " . gmdate ( "D, d M Y H:i:s", time () + $expire ) . "GMT" );
		header ( "Last-Modified: " . gmdate ( "D, d M Y H:i:s", time () ) . "GMT" );
		header ( "Content-Disposition: attachment; filename=" . $showname );
		header ( "Content-Length: " . $length );
		header ( "Content-type: " . $type );
		header ( 'Content-Encoding: none' );
		header ( "Content-Transfer-Encoding: binary" );
		if ($content == '') {
			readfile ( $filename );
		} else {
			echo ($content);
		}
		exit ();
	}
	
	/**
	 * 显示HTTP Header 信息
	 * 
	 * @return string
	 */
	static function getHeaderInfo($header = '', $echo = true) {
		ob_start ();
		$headers = getallheaders ();
		if (! empty ( $header )) {
			$info = $headers [$header];
			echo ($header . ':' . $info . "\n");
			;
		} else {
			foreach ( $headers as $key => $val ) {
				echo ("$key:$val\n");
			}
		}
		$output = ob_get_clean ();
		if ($echo) {
			echo (nl2br ( $output ));
		} else {
			return $output;
		}
	}
	
	/**
	 * HTTP Protocol defined status codes
	 * 
	 * @param int $num        	
	 */
	static function sendHttpStatus($code) {
		static $_status = array (
				
				// Informational 1xx
				100 => 'Continue',
				101 => 'Switching Protocols',
				
				// Success 2xx
				200 => 'OK',
				201 => 'Created',
				202 => 'Accepted',
				203 => 'Non-Authoritative Information',
				204 => 'No Content',
				205 => 'Reset Content',
				206 => 'Partial Content',
				
				// Redirection 3xx
				300 => 'Multiple Choices',
				301 => 'Moved Permanently',
				302 => 'Found', // 1.1
				303 => 'See Other',
				304 => 'Not Modified',
				305 => 'Use Proxy',
				
				// 306 is deprecated but reserved
				307 => 'Temporary Redirect',
				
				// Client Error 4xx
				400 => 'Bad Request',
				401 => 'Unauthorized',
				402 => 'Payment Required',
				403 => 'Forbidden',
				404 => 'Not Found',
				405 => 'Method Not Allowed',
				406 => 'Not Acceptable',
				407 => 'Proxy Authentication Required',
				408 => 'Request Timeout',
				409 => 'Conflict',
				410 => 'Gone',
				411 => 'Length Required',
				412 => 'Precondition Failed',
				413 => 'Request Entity Too Large',
				414 => 'Request-URI Too Long',
				415 => 'Unsupported Media Type',
				416 => 'Requested Range Not Satisfiable',
				417 => 'Expectation Failed',
				
				// Server Error 5xx
				500 => 'Internal Server Error',
				501 => 'Not Implemented',
				502 => 'Bad Gateway',
				503 => 'Service Unavailable',
				504 => 'Gateway Timeout',
				505 => 'HTTP Version Not Supported',
				509 => 'Bandwidth Limit Exceeded' 
		);
		if (isset ( $_status [$code] )) {
			header ( 'HTTP/1.1 ' . $code . ' ' . $_status [$code] );
		}
	}
}//类定义结束